mihaibudiu commented on code in PR #4959:
URL: https://github.com/apache/calcite/pull/4959#discussion_r3285663629


##########
core/src/main/java/org/apache/calcite/rex/RexCall.java:
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@@ -228,8 +228,13 @@ private boolean digestWithType() {
       return operands.get(0).isAlwaysFalse();
     case IS_NOT_FALSE:
     case IS_TRUE:
-    case CAST:
       return operands.get(0).isAlwaysTrue();
+    case CAST:

Review Comment:
   By adding an assertion that the type of the expression is Boolean you may 
catch other misuses.



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